Yea, but it was added into SQL from Spark 2.2.0 2017-07-19 23:02 GMT+09:00 Matthew cao <cybea...@gmail.com>:
> I am using version 2.1.1 As I could remember, this function was added > since 2.1.0. > > On 2017年7月17日, at 12:05, Burak Yavuz <brk...@gmail.com> wrote: > > Hi Matthew, > > Which Spark version are you using? The expression `to_json` was added in > 2.2 with this commit: > https://github.com/apache/spark/commit/0cdcf9114527a2c359c25e46fd6556 > b3855bfb28 > > Best, > Burak > > On Sun, Jul 16, 2017 at 6:24 PM, Matthew cao <cybea...@gmail.com> wrote: > >> Hi all, >> I just read the databricks blog here: https://docs.databricks. >> com/_static/notebooks/complex-nested-structured.html >> >> When I try to follow the example about the to_json and selectExpr part, >> it gave error: “org.apache.spark.sql.AnalysisException: Undefined >> function: 'to_json'. This function is neither a registered temporary >> function nor a permanent function registered in the database 'default'.; >> line 1 pos 0”. >> Also this error show in the original databricks notebook. I know that >> to_json function works great with select. Do I miss something when using >> selectExpr? THX. >> >> Best, >> Matthew >> >> > >
